Your amp sounds substantial at 250/ch @ 8 ohms but remember, the Vandies dip to below 4 ohms in the lower frequencies. However, their phase angle remains fairly benign which makes them pretty easy to drive.
As for the 3A vs the 2Ce Sig, the biggest difference I found was the 3A's ability to play louder in the bass. It also is as Sdcampbell says in comparison of the mids and highs. It's a more refined speaker. I do feel at the price 3A's have been selling for, it would be the best buy.
As Sdcampbell says above, the footprint is the same. The stand for the 3A is slightly larger but doesn't take up more room . It wouldn't cost that much more to ship them over the 2Ce Sig.
As for the 3A vs the 2Ce Sig, the biggest difference I found was the 3A's ability to play louder in the bass. It also is as Sdcampbell says in comparison of the mids and highs. It's a more refined speaker. I do feel at the price 3A's have been selling for, it would be the best buy.
As Sdcampbell says above, the footprint is the same. The stand for the 3A is slightly larger but doesn't take up more room . It wouldn't cost that much more to ship them over the 2Ce Sig.